A particle moves around a semicircle of radius R, from one end A of a diameter to the other B. It is attracted to its starting point A by a force proportional to its distance from A. When the particle is at B, the force towards A is F0. Calculate the work done against this force when the particle moves around the semicircle from A to B.

Which of the following are appropriate acceleration units?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

Ais not a mixture. colloid compound suspension solution